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ML270 Loss of Power

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by MartyR, Sep 27, 2019.

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  1. MartyR

    MartyR Member

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    Your Mercedes:
    2005 ML 270, 2007 Clio 197
    Hi All,

    New to the forum and MB.

    So I have be surfing the internet and this loss of power with the ML270 05 seems to be a common issue and seems an fairly easy issue to rectify from my reading.

    However I though I would ask for advice on the problem in case I miss something and a few more ideas can never hurt.

    So my ML270 is suffering a serious loss of power after driving for 5-35 mins, this only happens on acceleration and the exhaust fumes block out the sun for the poor motorist behind (Unless they drive an Audi then I don't care). After reading forum and general google fun my first though was the MAF as it doesn't seem to be burning fuel completely.

    However after taking it to my local garage they said the fault suggested it was a lack of boost on the turbo, which in my mind would make sense as well and would explain the volcanic plumes of black smoke pouring out the back (I exaggerate slightly on this).

    So I know the previous said that he had the turbo rebuilt recently????? the car has been serviced somewhat but judging by the air filter I pulled out I think this only happened until 2006. the only other fault code I'm getting is the glow plugs. Having looked at the turbo by recent rebuild he may mean 5 years ago as it doesn't look likely but I may be wrong.

    My feeling is the turbo isn't creating enough boost so the engine is over fuelling.

    Can anyone help and point me to where I should look next?

    Many thanks

    Martin
     
  2. bembo449

    bembo449 Senior Member

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    Your Mercedes:
    w221 320cdi , r170 23k , range rover vogue , insignia vxr , shitron dispatch
    blocked cat , inlet manifold , EGR , knackered injectors , was star used to diagnose the glow plugs ??
     
  3. OP
    MartyR

    MartyR Member

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    Hi, Not sure if it was star however he did assure me it was a top of the range scanner.
     
  4. bembo449

    bembo449 Senior Member

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    probs not star then as that would be able to pin point the exact issue pal
     
  5. OP
    MartyR

    MartyR Member

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    I think my gut is telling me its boost issue but then I have been wrong about a lot of things. As I said I think the black smoke is showing over fuelling. I think I will have to find a independent this weekend and see.
     
  6. bembo449

    bembo449 Senior Member

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    black smoke suggests a split boost pipe pal
     
  7. LostKiwi

    LostKiwi Senior Member

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    Your Mercedes:
    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Split hoses to the intercooler are a common issue. The split can be hard to see. Smoke testing the pipework is usually the best way to find it.
     
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  8. OP
    MartyR

    MartyR Member

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    So this afternoon after myself and friend decided to check the egr, turbo etc. So we discovered that the turbo was producing boost by disconnecting it to the intercooler and had boost. Next we tested to past the intercooler to the egr and again got boost.

    So we noticed that the egr was caked in carbon so removed this and cleaned it out thinking it was stuck open however it was closed so no dice.

    Then we followed it to the inlet manifold, there we noticed that where the engine beautification panel bolt holes are a lot of air was blowing out of the one closest to the front of the engine. Very strange but maybe normal as this is the first ML I have had.

    My question is clearly this would cause a fault as it would lose boost in a system that needs pressure but am I missing something still?

    Cheers

    Martin
     
  9. OP
    MartyR

    MartyR Member

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    Just to add, when we had the pipe of past the intercooler we were still getting loads of smoke. Could this be the breather pipe filter on the turbo side being blocked?

    Cheers

    Martin
     
  10. OP
    MartyR

    MartyR Member

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    Just a picture of the offending part
     

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  11. Taffy7hfa

    Taffy7hfa Senior Member

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    Seems like a bit too much guesswork going on here, I would get it on Star and see what the live data says.
     
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  12. OP
    MartyR

    MartyR Member

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    So I have “fixed” the blow but alas still losing boost. I think getting it scanned is the best option now as i have exhausted my limited knowledge
     
  13. Taffy7hfa

    Taffy7hfa Senior Member

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    Potentially lots of things it could be so Star is definitely your best option ;)
     
  14. OP
    MartyR

    MartyR Member

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    Yeah I agree, have to bite the bullet and take it to my local MB service centre in the week. Oh how I’m looking forward to that :)
     
  15. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Find a local independent and it won't be such a horrible experience :) yours sounds like a boost leak somewhere but does need diagnostics to confirm root cause.
     
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  16. OP
    MartyR

    MartyR Member

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    Thanks for the steer, there is one in Tamworth so will call them tomorrow and arrange a visit :) fingers crossed I won’t be single afterwards :)
     
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  17. OP
    MartyR

    MartyR Member

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    Well happy days I’m stuck about 3 miles from home waiting to be rescued. Diagnosis = dead battery, lights up but no turn over. Looks like it’s being abandoned for the night :)
     
  18. Taffy7hfa

    Taffy7hfa Senior Member

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    Batteries don't seem to give any obvious signs of impending failure like they used to, one day they appear ok, next day they die,
    I'm guessing they are responsible for lots of the issues people post on here though.
     
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  19. OP
    MartyR

    MartyR Member

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    I agree they seem to be the last thing anything thinks of. That being said it may not be the battery, could be a wet alternator. I did notice in the battery box the main pos cable that I believe feeds to the alternator looks like it has some damage which I didn’t notice before.

    My main feeling it’s the battery was the battery warning light was coming intermittently after about 10 mins the radio died, the ac cut out and then the gauges lit up.

    A colleague did say it could be water in the fuse box or a earthing fault.

    Either way it’s multi meter time this weekend. I’m started to wonder why I bought this car ;)
     
  20. joderest

    joderest Senior Member

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    have you managed to resolve this issue.
     
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